\ 



'20 NOHTII AMERICAN 



behind the antennae there are pits bordering immediately upon the eye; 

 punctures fine, rounded, very unevenly distributed, interspaces shining, 

 feebly convex; ocular lines meeting at one length in advance; antennae 

 longer than width of head, slender, piceous-black, club strong, clothed with 

 pale piceo-cinereous pubescence ; third joint one-half longer than the fourth, 

 fourth and fifth equal, sixth and seventh equal in length, the latter two- 

 thirds thicker, eighth thicker than the seventh, almost exactly globular, 

 .joints of club increasing in length, last two much larger than the ninth, 

 sub-equal in thickness ; maxillary palpi rather long, first joint and base of 

 second piceo-testaceous, second twice as long as the first, piceous-black, third 

 rather long, piceous-black, rather abruptly enlarged toward the tip, and 

 somewhat sigmoid. Prothorax robust, widest slightly in advance of the 

 middle, where it is nearly as wide as the head and distinctly narrower than 

 long ; sides thence very feebly convergent posteriorly and straight ; anterior 

 and posterior margins very feebly and equally arcuate, sub-equal in length ; 

 apical and basal angles not rounded ; surface feebly and broadly tuberculate 

 near the basal angles, transversely impressed behind the vertex, rather 

 finely, somewhat deeply, very closely, and confusedly channeled; canalicu- 

 lation very narrow and distinct, terminating within one-fifth the pronotal 

 length of the base and apex. Elytra at base much wider than the head ; 

 sides feebly divergent posteriorly, nearly straight toward the humeri, dis- 

 tinctly arcuate toward the vertices ; together very broadly, roundly, and 

 rather feebly emarginate behind; suture slightly longer than the width at 

 base, one-third longer than the pronotum ; surface very deeply, extremely 

 closely, rather coarsely, and very irregularly channeled ; there are two 

 completed vortices at the base, and one near the apex of each elytron. 

 Abdominal segments decreasing uniformly and extremely gradually in 

 width, first very slightly narrower than the contiguous elytra ; surface very 

 feebly convex, finely, rather distantly and evenly punctulate, shining; 

 border very strong ; transverse carinae tricuspid, middle cusps finely acumi- 

 nate, lateral very short and rudimentary. Legs rather short, slender, 

 black ; first joint of posterior tarsi two-thirds longer than the second, much 

 shorter than the fifth, second very slightly longer than the third; all 

 robust. 



Male. — Fourth and fifth ventral segments emarginate in the middle two- 

 fifths at apex, emargination of the former rounded and. 'very feeble, that of 

 the latter evenly rounded, strong, about four times as wide as deep, con- 

 tiguous surface of fourth impressed feebly for a short distance, that of fifth 

 strongly impressed nearly throughout, impression having the lateral bonders 

 in the form of acute ridges, all depressed areas being bordered by a very 

 dense line of erect, coarse, flavate setae ; sixth segment sinuate at tip, sinus 

 narrower and more acutely rounded than the apices, more than one-half 

 wide]' than deep ; seventh segment roundly emarginate at tip. 



Female. — Sixth ventral segment rather acutely rounded behind, surface 

 finely reticulated and minutely punctulate. 



Length 4.0 mm. 



Vancouver Island (Crotch), 1 ; Washington Territory, 6. 



